A headless fastener externally threaded on both ends with each threaded portion of one but not necessarily the same nominal diameter. It is designed to be locked in place by either a ring, lock, serrated or a ring, lock, keyed.
NSN 5905-01-222-0927
NSN 5945-01-278-9211
NSN 5990-00-137-3971
NSN 5960-01-516-7264
NSN 5935-01-076-6486
NSN 6610-01-519-8953
NSN 6620-01-162-8001
NSN 5930-00-005-7156
NSN 5895-01-585-4695
NSN 5990-01-576-4383
NSN 6105-01-226-8125
NSN 5990-00-306-0222